lawrence



(No Model.) 4 Sheets-Sheet 1. L. P. LAWRENGE.

LOOOMOTIVE BRAKE.

No. 403,277. Patented May 14, 1889.

WITNESSES:

N. PETERS. Pl! J-Elbcgrtlphnf, Wuhingon, n. a

(No Model.) Q 4 SheetsSheet 2. L. P. LAWRENCE.

LOOOMOTIVE BRAKE. No. 403,277. Patented May 14, 1889.

WITNESSES:

. IVVE/VT H. w 7

KMM I ATTORNEY)? N. PETERS, Pfimvlilhngnphur, Wnhlnglorl. o. c.

No Model.) 4 Sheets-Sheet 4.

L. P. LAWRENCE.

. LOGOMOTIVB BRAKE. I 110,403,277. Patented May 14, 1889.

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ATTORNEY! I UNITED STATES PATENT OFFICE.

LOUIS P. LAWRENCE, OF PASSAIC, NEWV JERSEY, ASSIGNOR TO THE LAlV- RENOERAILWAY BRAKE COMPANY, OF NEW YORK, N. Y.

LOCOMOTlVE-BRAKE.

SPECIFICATION forming part of Letters Patent No. 403,277, dated May 14,1889.

Application filed November 22, 1888. Serial No. 291,536. (No model.)

T on whom it may concern.-

Be it known that I, Lou s P. LAWRENCE, of Passaic, in the county ofPassaic and State of New Jersey, have invented certain new and usefulImprovements in Locomotive-Brakes, of which the following is aspecification.

This invention relates to that class of brakes that are operated byvacuum or by compressed air, steam, or any other like medium underpressure.

The object of my invention is to provide a brake of this kind which issimple in construction and'effective and reliable in use.

The invention consists in the combination of parts and details, as willbe fully described and set forth hereinafter, and finally pointed out inthe claims.

In the accompanying drawings, Figure 1 is a side view of a locomotiveprovided with my improved brake, parts being broken out. Fig. 2 is arear end view of the sam e, parts being in section and others omitted.Fig. 3 is a vertical longitudinal sectional View of brakeshoe, saddle,and cylinder on the line a; :0, Fig. 5. Fig. 4 is a vertical transversesectional View of the same 011 the line y y, Fig. 3. Fig. 5 is ahorizontal sectional view on the line 10 10, Fig. 3. Fig. 6 is a topview of the parts shown in Figs. 3, at, and 5.

Similar letters of reference indicate corresponding parts.

The cylinder A for operating the brakeshoe B is made in the shape ofaflattened ellipsethat is, the sides are parallel and the ends arerounded off, as shown in Fig. 2, but, if desired, may be at right anglesto the sides. The cylinder is flattened, so that its longitudinalcentral vertical plane will be about in line with the verticallongitudinal central plane of the wheel, and the width of the cylinderwill be about equal to the width of the rim of the wheel. Said cylinderis cast integral with the saddle or plate D, from the outer face ofwhich it projects, said saddle forming one of the sides of the cylinder.That head A of the cylinder facing the rim of the wheel a is castintegral with the cylinder, and the other or outer head, A, is removableand is bolted on the cylinder. The saddle or plate D is riveted orbolted to angle-pieces D, which in turn are riveted or bolted to theframe I) of the locomotive, so as to be adjacent to the rims of thewheels at. The cylinder A has a wing, O, at the outer side, forming withthe saddle or plate D and the head A a pocket, 0, for receiving thebrake-shoe.

The brake-shoe B is provided on its rear surface with two lugs, E, atthe middle of its height, and between said lugs one end of a link, E, ispivoted by a pin, E passed through holes E in said lugs. The upper endof the link is mounted to swing on a pin, F, passed through an openingin the saddle D and through two lugs, H, on the upper end of thecylinder, the upper end of the link E being between said lugs. Aspring-latch, G, contained in a casing or box, G, on the top of thecylinder enters the annular groove F in the pin F and prevents said pinfrom moving in the direction of its length. Saidpin has a handle-ring,Fat one end. The lugs E have holes E at both ends, so as to permit ofreversing the shoe.

The lower end of the link E is provided with a lip, E, for a purposethat will be set forth hereinafter. The lugs E are provided with flangesJ, projecting toward each other and forming a pocket for receiving thehead or enlargement K on the front end of a link, K, pivoted to swinglaterally by a pin, K at the inner end of a slightly-flaring bore of aprojection, L, at the center of the piston L, fitting and working in thecylinder A. The lip E of the link E engages the head K, as shown in Fig.3.

The projection L, which has a uniform exterior diameter or dimensions,passes through a corresponding aperture, M, in the fixed head A of thecylinder. Said head is provided on its inner surface with an annularflange, M, along the edge of the aperture M, and on the same apacking-ring, N, is placed, which is held in place by the ring N, havingan internal flange on one edge and an external flange on the other edge.

A spiral spring, 0, surrounding the tubular projection L has one endrested against the closed end of a pocket, L in the piston L and theother end on the exterior flange of the ring N, and thus serves toholdsaid ring and the packing N in place. The piston L is provided witha threaded stem, S, which is screwed into a tubular nut, T, mounted toturn in the neck U, projecting from the inner and outer surfaces of thehead A, said nut T being provided at its inner end with an exteriorflange, T ,which rests against the inner end of the neck U.

The nut T is provided near its outer end with a partition, T and with arecessed head, T on its end. A sliding bolt, \V, projects through thebottom of the recessed head 1 the partition T and into a correspondingbore, \V, in the stem S. A lug, projects from the bolt W into thelongitudinal groove \V in the bore W to prevent the bolt from turning inthe stem S. The bolt is provided with a projection, V, which can passinto a notch or recess, V in the partition T and in line with the groove\V". A spiral spring, on, surrounding the bolt \V bears on theprojection V and keeps the same in the recess V The outer end of thebolt "W is pivoted to an eccentric-lever, n, resting on the bottom orinner end of the head T.

The packing r is placed in an annular recess in the inner surface of thecylinder and is held in place by the head A. Each cylinder A isconnected by a pipe, 71., with the pipe 70, which in turn is connectedwith the ejector g, and each head A is provided with an aperture, Z.

The operation is as follows: hen the brake is to be applied, the air isexhausted by the ejector from that part of the cylinder between thepiston. L and the cylinder-head A when the exterior air, acting on thepiston L, presses the same in the direction of the arrow :13. The linkK, acting on the shoe, presses the same against the rim of the wheel.The wheels give sidewise, and when the brake-shoes are applied they movelaterally with the wheels. As the shoes are suspended by the links Efrom the pins F, such movement possible. As the bore of the projection Lis made flaring, the link can swing in the same as the shoe moves1aterally. There is thus no danger of undue strains on thelocomotiveframe by the lat" eral movements of the shoes with the wheels.\Vhen the vacuum is destroyed, the compressed spring 0 expands andpresses the piston in the inverse direction of the arrow :0, and thehead K of the link K, acting on the flanges J of the lugs E, draws theshoe from the rim of the wheel. As the shoe wears off the slack must betaken up; and. this is done in the following manner: The cam-lever a isturned so as to pull outward the bolt WV suiliciently to remove theprojection V from the notch or recess V in the partition T thuspermitting of turning the nut. This nut cannot move in the direction ofits length, and therefore moves the stem. S and the piston L, with whichit is made integral, a short distance toward the rim of the wheelthatis, sufficiently to take up the slack caused by the wearing of the shoe.After the parts have thusbeen adjusted, the cam-lever n is swung backand. then the spring m presses the projection V into the notch V in thepartition T thus preventing the nut T from turning. The bolt TV isprevented from turning in the stem S by the projection \V in the grooveNV.

The centers of the shoes are about at the horizontal central lines ofthe wheels, and thus there is no danger of derailment in case the brakesare released suddenly at a time when the wheels are not true on therails. By making the actuating or operating device for each shoeseparate and independent of the other shoes I am enabled to arrange theshoes in this manner.

llavin g thus described my invention, I claim as new and desire tosecure by Letters Paten t 1. The combination, wit-h a locomotiveframe,of a cylinder projecting laterally from said frame adjacent to the rimof the wheels, the open end of said cylinder facing the rim of thewheel, and the said cylinder being flattened to have approximately thewidth of the wheel-rim, the long axis of said cylinder bcing parallelwith one of the diameters of the wheel, a piston in said cylinder, and abrakeshoe connected with said piston and located between said piston andthe rim of the wheel, substantially as set forth.

2. The combination, with a locomotiveframe, of a cylinder proj eetinglaterally from the same, the open end of said cylinder facing the rim ofthe wheel, a piston in said cylinder, a brakeshoe operated by saidpiston and located between the piston and the rim of the wheel, and alink pivoted to the brake shoe and to the top of the cylinder containingthe piston that operates the shoe, substantially as set forth.

3. The combination, with a cylinder, of a piston in the same providedwith a screwthreaded stem, and a cylindrical nut screwed on the stem andmounted to slide in an aperture in one head of the cylinder,substantially as set forth.

4. The combination, with a cylinder, of a piston having a screw-threadedstem,a cylindrical nut screwed on said stem and mounted to slide in anaperture in one head of the cylinder, and a belt for locking the nut onsaid stem, substantially as set forth.

5. The combination, wi "11 the cylinder A, of the piston L, having theprojection L, the link K, pivoted in the bore of said projection L, andhaving the head K on its outer end, and the blfllifiSllOG B, having theflanged lugs E, substantially as set forth.

6. The combination, with the cylinder A, of the piston L, having theprojection L, the brake-shoe 1-3, the spring 0, the packing N, and theflanged. ring N, substantially as set forth.

7. The combination, with a cylinder proj ecting from a plate and havinga wing on that side of the cylinder opposite the one connected with theplate, of abrake-shoe between 10 said plate and Wing, and a piston inthe cylinder connected with the brake-shoe, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

LOUIS P. LAWRENCE.

Witnesses:

CARL KARP, JOHN A. STRALEY.

